Computer Tech and DIY Robotics

Linux

It’s common when you unplug and plugin a usb device on linux for the device name to change. i.e. from /dev/ttyUSB1 to /dev/USB2. This poses a problem when you want to programmatically access these devices. You can however use udev rules to ensure the device always has a familiar name as a link to the […]

My objective was to have two apache web servers that were load balanced, but I didn’t want to have a single point of failure load balancer and I didn’t want to spend the resources of two more servers solely for a highly available load balancer. So I combined to run the load balancers on the […]

This is usually caused by a DNS resolution problem rather than an actual NTP issue. I power up and shutdown test machines all the time so things are always changing. If the configured DNS is no longer valid then boot up time can be painfully slow. In order to speed up the process there are […]

I have painstakingly been through numerous ‘How To’ articles for setting up AD authentication for my Linux servers all of which have never worked perfectly. If you’ve had similar experiences then just forget all those ‘How To’ articles. Download the open source utility from Likewise that does all the work for you. It simply works!

If you missed installing the Development Tools in the initial install, there is a quick way to load them without installing them individually. yum groupinstall ‘Development Tools’ This will install gcc, make, automake plus otther tools with all their dependencies and libraries.

To get the Software Updater application in CentOS/Red Hat to use a web proxy server, add the following line in the [Main] section of the /etc/yum.conf file. proxy=http://{proxyserver}:{port}/ Be sure to keep the trailing / slash on the end.